20778546 has 16 divisors (see below), whose sum is σ = 42524064. Its totient is φ = 6765024.

The previous prime is 20778521. The next prime is 20778551. The reversal of 20778546 is 64587702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40011 + ... + 40526.

It is an arithmetic number, because the mean of its divisors is an integer number (2657754).

Almost surely, 2^20778546 is an apocalyptic number.

20778546 is an abundant number, since it is smaller than the sum of its proper divisors (21745518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20778546 is a wasteful number, since it uses less digits than its factorization.

20778546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80585.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 20778546 is about 4558.3490432392. The cubic root of 20778546 is about 274.9191872736.

The spelling of 20778546 in words is "twenty million, seven hundred seventy-eight thousand, five hundred forty-six".